working text

src/utils.rs

@@ -0,0 +1,24 @@
+use rusttype::{point, Font, Scale};
+
+pub fn measure_text(font: &Font, text: &str, scale: Scale) -> (u32, u32) {
+    let v_metrics = font.v_metrics(scale);
+    let ascent = v_metrics.ascent;
+    let descent = v_metrics.descent;
+    let height = (ascent - descent).ceil() as u32;
+
+    let width = font
+        .layout(text, scale, point(0.0, 0.0))
+        .last()
+        .map(|g| {
+            let bb = g.pixel_bounding_box();
+            if let Some(bb) = bb {
+                bb.max.x as f32
+            } else {
+                g.position().x
+            }
+        })
+        .unwrap_or(0.0)
+        .ceil() as u32;
+
+    (width, height)
+}